Blog | Pythian (46)

Oracle

Oracle Data Pump Can't Import LONG Columns

If you are using Oracle Data Pump to backup tables containing LONG or LONG RAW columns, then you might be surprised ...

Oracle

Oracle 10g R2 RAC - vip on wrong interface

Problem Statement I was installing RAC, and during the clusterware install I picked up the wrong interfaces for public ...

Oracle

Basic I/O Monitoring on Linux

This is my fourth week at Pythian and in Canada and I'm starting to get back to my normal life cycle --- my personal ...

Oracle

Implementing Many-to-many Relationships in Data Warehousing

Context This article will discuss how to make many-to-many relationships in data warehousing easily queried by novice ...

Oracle

Sequences in Oracle 10g RAC

Just recently I got a call from a developer. He had a table with a primary key populated by a sequence, a timestamp ...

Oracle

Oracle Data Pump Schema Export and Public Synonyms

Background While testing a migration today with one of our clients, I figured out that schema export using Data Pump ...

Oracle

Slow rman Backups? Check This Out

Notice If you have found rman backups slow in Oracle 10.2.0.2, you should check out note 375386.1 on metalink. It seems ...

Oracle

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

My apologies — there will be no broccoli in this post. Introduction Many people would like to know how well their ...

Oracle

ASM multi-disk performance

This is a fascinating look into storage architecture! It perfectly illustrates that "more hardware" doesn't always ...

Oracle

ORA-07202: sltln: invalid parameter to sltln

Context I hit this issue today while creating a new 10.2.0.3 database using DBCA. Recently, I’ve started to use DBCA ...

Oracle

Oracle block corruptions, DBV vs RMAN

Over-the-Top Tales from the Trenches Motto: Bringing order to the chaos of every day DBA life. Dear Diary, Is that a ...

Oracle

Silly DBA Tricks 1: Editing the SPFILE

Here is an article I posted on the Oracle-L mailing list recently. Much to my surprise, people liked it enough that ...

Oracle

Oracle: How to move a table to another schema?

Backstory A client asked me, “How can I move a table to another schema in Oracle?” The quick answer I gave him is, “not ...

Oracle

RMAN Skip Tablespace Issue

Important We came across something in RMAN while working on a duplicate database. The ‘skip tablespace’ command when ...

MySQL

MySQL Recipes: Promoting a Slave to Master or Changing Masters

Briefing Not a dear diary post today — I have a couple up my sleeve though. In the corporate world, promoting a slave ...

Oracle

The Mysterious World of Shmmax and Shmall

Over the Top Tales from the trenches. Motto: Bringing order to the chaos of every day DBA life. Dear Diary, Today I ...

Oracle

Speeding-Up Oracle Export/Import Migration

Or, How To Become an Export/Import Migration Superstar! We’ve already established that I like broccoli. I get the taste ...

Oracle

Failovers with Oracle Dataguard

In the last month, we have been hit with two clients’ large-scale failures. The first involved network issues; the ...

MySQL

MySQL: Tuning filesorts and temporary tables

Goal: Getting rid of filesorts and temporary tables by tuning MySQL queries. Background: Filesorts and temp tables are ...

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Oracle Data Pump Can't Import LONG Columns

Oracle 10g R2 RAC - vip on wrong interface

Basic I/O Monitoring on Linux

Implementing Many-to-many Relationships in Data Warehousing

Sequences in Oracle 10g RAC

Oracle Data Pump Schema Export and Public Synonyms

Slow rman Backups? Check This Out

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

ASM multi-disk performance

ORA-07202: sltln: invalid parameter to sltln

Oracle block corruptions, DBV vs RMAN

Silly DBA Tricks 1: Editing the SPFILE

Oracle: How to move a table to another schema?

RMAN Skip Tablespace Issue

MySQL Recipes: Promoting a Slave to Master or Changing Masters

The Mysterious World of Shmmax and Shmall

Speeding-Up Oracle Export/Import Migration

Failovers with Oracle Dataguard

MySQL: Tuning filesorts and temporary tables

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